Electroacoustic transducer

Abstract

An electroacoustic transducer is provided and includes: a diaphragm having a pair of longitudinal split tubular surfaces arranged next to each other, a valley being formed between respective side portions of the pair of longitudinal split tubular surfaces; a converter including a magnet mechanism and a voice coil configured to perform conversion between vibration of the diaphragm along a depth direction of the valley and an electric signal corresponding to the vibration; and a supporter that supports the diaphragm such that the diaphragm is vibratable along the depth direction of the valley. A tubular portion is provided at an intermediate portion of the valley to couple the diaphragm and the voice coil to each other, and the tubular portion extends in the depth direction of the valley.

The invention claimed is: 
     
       1. An electroacoustic transducer, comprising:
 a diaphragm comprising a wing-pair portion in which a pair of longitudinal split tubular surfaces are arranged next to each other, and a valley is formed between respective side portions of the pair of longitudinal split tubular surfaces and an end plate that closes opposite ends of the valley; 
 a converter comprising a magnet mechanism and a voice coil configured to perform conversion between vibration of the diaphragm along a depth direction of the valley and an electric signal corresponding to the vibration; and 
 a supporter that supports the diaphragm such that the diaphragm is vibratable along the depth direction of the valley, 
 wherein
 a tubular portion is provided at an intermediate portion of the valley to couple the diaphragm and the voice coil to each other, and the tubular portion extends in the depth direction of the valley, and 
 the wing-pair portion and the end plate are fixed to one another such that the wing-pair portion and the end plate move together when activated by the voice coil. 
 
 
     
     
       2. The electroacoustic transducer according to  claim 1 , wherein the diaphragm comprises a through hole formed at a position at which the tubular portion is provided, and the diaphragm is provided with a cap member that closes the through hole. 
     
     
       3. The electroacoustic transducer according to  claim 2 , wherein the cap member comprises a pair of longitudinal split tubular surfaces and a valley respectively connected to the pair of longitudinal split tubular surfaces and the valley of the diaphragm. 
     
     
       4. The electroacoustic transducer according to  claim 1 , wherein the tubular portion is provided on a deep-side surface of the diaphragm in the depth direction of the valley, without a through hole formed through the diaphragm at a position at which the tubular portion is provided. 
     
     
       5. The electroacoustic transducer according to  claim 1 , wherein the tubular portion is coupled to the diaphragm such that a direction in which an axis of the tubular portion extends substantially coincides with a direction in which the diaphragm is vibrated. 
     
     
       6. The electroacoustic transducer according to  claim 1 ,
 wherein the valley extends in an extending direction intersecting the depth direction of the valley, and 
 wherein the tubular portion is coupled to the diaphragm at a position between a central position of the valley in the extending direction and an end portion of the diaphragm. 
 
     
     
       7. The electroacoustic transducer according to  claim 1 , wherein the tubular portion has a circular shape and the voice coil has a cylindrical shape, and wherein the tubular portion is coupled to the voice coil in a state in which an axis of the tubular portion coincides with an axis of the voice coil. 
     
     
       8. The electroacoustic transducer according to  claim 1 , wherein a through hole is formed on the wing-pair portion, and
 wherein the tubular portion is coupled to a portion of the wing-pair portion at which the through hole is formed.